627 lines
12 KiB
C
627 lines
12 KiB
C
/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#ifdef __FreeBSD__
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# ifndef __FreeBSD_cc_version
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# include <osreldate.h>
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# else
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# if __FreeBSD_cc_version < 430000
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# include <osreldate.h>
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# endif
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# endif
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#endif
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#ifdef __sgi
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# include <sys/ptimers.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#if !defined(__SVR4) && !defined(__GNUC__)
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#include <strings.h>
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <sys/time.h>
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#include <net/if.h>
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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#include <netinet/ip.h>
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#include <netdb.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include "ip_compat.h"
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#include "ip_fil.h"
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#include "ip_nat.h"
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#include "ip_state.h"
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#include "ipf.h"
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#include "ipl.h"
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#if !defined(lint)
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static const char sccsid[] = "@(#)ipf.c 1.23 6/5/96 (C) 1993-2000 Darren Reed";
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static const char rcsid[] = "@(#)$Id: ipf.c,v 2.10.2.14 2002/04/10 04:56:36 darrenr Exp $";
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#endif
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#if SOLARIS
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static void blockunknown __P((void));
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#endif
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#if !defined(__SVR4) && defined(__GNUC__)
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extern char *index __P((const char *, int));
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#endif
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extern char *optarg;
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void frsync __P((void));
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void zerostats __P((void));
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int main __P((int, char *[]));
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int opts = 0;
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int use_inet6 = 0;
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static int fd = -1;
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static void procfile __P((char *, char *)), flushfilter __P((char *));
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static void set_state __P((u_int)), showstats __P((friostat_t *));
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static void packetlogon __P((char *)), swapactive __P((void));
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static int opendevice __P((char *));
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static void closedevice __P((void));
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static char *getline __P((char *, size_t, FILE *, int *));
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static char *ipfname = IPL_NAME;
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static void usage __P((void));
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static int showversion __P((void));
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static int get_flags __P((void));
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#if SOLARIS
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# define OPTS "6AdDEf:F:Il:noPrsUvVyzZ"
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#else
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# define OPTS "6AdDEf:F:Il:noPrsvVyzZ"
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#endif
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static void usage()
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{
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fprintf(stderr, "usage: ipf [-%s] %s %s %s\n", OPTS,
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"[-l block|pass|nomatch]", "[-F i|o|a|s|S]", "[-f filename]");
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exit(1);
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}
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int main(argc,argv)
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int argc;
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char *argv[];
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{
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int c;
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while ((c = getopt(argc, argv, OPTS)) != -1) {
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switch (c)
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{
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case '6' :
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use_inet6 = 1;
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break;
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case 'A' :
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opts &= ~OPT_INACTIVE;
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break;
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case 'E' :
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set_state((u_int)1);
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break;
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case 'D' :
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set_state((u_int)0);
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break;
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case 'd' :
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opts |= OPT_DEBUG;
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break;
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case 'f' :
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procfile(argv[0], optarg);
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break;
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case 'F' :
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flushfilter(optarg);
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break;
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case 'I' :
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opts |= OPT_INACTIVE;
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break;
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case 'l' :
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packetlogon(optarg);
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break;
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case 'n' :
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opts |= OPT_DONOTHING;
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break;
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case 'o' :
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break;
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case 'P' :
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ipfname = IPL_AUTH;
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break;
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case 'r' :
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opts |= OPT_REMOVE;
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break;
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case 's' :
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swapactive();
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break;
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#if SOLARIS
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case 'U' :
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blockunknown();
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break;
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#endif
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case 'v' :
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opts += OPT_VERBOSE;
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break;
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case 'V' :
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if (showversion())
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exit(1);
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break;
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case 'y' :
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frsync();
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break;
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case 'z' :
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opts |= OPT_ZERORULEST;
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break;
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case 'Z' :
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zerostats();
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break;
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default :
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usage();
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break;
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}
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}
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if (fd != -1)
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(void) close(fd);
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exit(0);
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/* NOTREACHED */
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}
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static int opendevice(ipfdev)
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char *ipfdev;
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{
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if (opts & OPT_DONOTHING)
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return -2;
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if (!ipfdev)
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ipfdev = ipfname;
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if (!(opts & OPT_DONOTHING) && fd == -1)
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if ((fd = open(ipfdev, O_RDWR)) == -1)
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if ((fd = open(ipfdev, O_RDONLY)) == -1)
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perror("open device");
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return fd;
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}
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static void closedevice()
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{
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close(fd);
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fd = -1;
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}
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static int get_flags()
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{
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int i;
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if ((opendevice(ipfname) != -2) && (ioctl(fd, SIOCGETFF, &i) == -1)) {
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perror("SIOCGETFF");
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return 0;
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}
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return i;
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}
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static void set_state(enable)
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u_int enable;
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{
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if (opendevice(ipfname) != -2)
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if (ioctl(fd, SIOCFRENB, &enable) == -1) {
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if (errno == EBUSY)
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fprintf(stderr,
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"IP Filter: already initialized\n");
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else
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perror("SIOCFRENB");
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}
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return;
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}
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static void procfile(name, file)
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char *name, *file;
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{
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FILE *fp;
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char line[513], *s;
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struct frentry *fr;
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u_int add, del;
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int linenum = 0;
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(void) opendevice(ipfname);
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if (opts & OPT_INACTIVE) {
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add = SIOCADIFR;
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del = SIOCRMIFR;
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} else {
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add = SIOCADAFR;
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del = SIOCRMAFR;
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}
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if (opts & OPT_DEBUG)
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printf("add %x del %x\n", add, del);
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initparse();
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if (!strcmp(file, "-"))
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fp = stdin;
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else if (!(fp = fopen(file, "r"))) {
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fprintf(stderr, "%s: fopen(%s) failed: %s\n", name, file,
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STRERROR(errno));
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exit(1);
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}
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while (getline(line, sizeof(line), fp, &linenum)) {
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/*
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* treat CR as EOL. LF is converted to NUL by getline().
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*/
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if ((s = index(line, '\r')))
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*s = '\0';
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/*
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* # is comment marker, everything after is a ignored
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*/
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if ((s = index(line, '#')))
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*s = '\0';
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if (!*line)
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continue;
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if (opts & OPT_VERBOSE)
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(void)fprintf(stderr, "[%s]\n", line);
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fr = parse(line, linenum);
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(void)fflush(stdout);
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if (fr) {
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if (opts & OPT_ZERORULEST)
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add = SIOCZRLST;
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else if (opts & OPT_INACTIVE)
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add = (u_int)fr->fr_hits ? SIOCINIFR :
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SIOCADIFR;
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else
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add = (u_int)fr->fr_hits ? SIOCINAFR :
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SIOCADAFR;
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if (fr->fr_hits)
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fr->fr_hits--;
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if (fr && (opts & OPT_VERBOSE))
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printfr(fr);
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if (fr && (opts & OPT_OUTQUE))
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fr->fr_flags |= FR_OUTQUE;
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if (opts & OPT_DEBUG)
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binprint(fr);
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if ((opts & OPT_ZERORULEST) &&
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!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, add, &fr) == -1) {
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fprintf(stderr, "%d:", linenum);
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perror("ioctl(SIOCZRLST)");
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} else {
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#ifdef USE_QUAD_T
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printf("hits %qd bytes %qd ",
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(long long)fr->fr_hits,
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(long long)fr->fr_bytes);
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#else
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printf("hits %ld bytes %ld ",
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fr->fr_hits, fr->fr_bytes);
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#endif
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printfr(fr);
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}
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} else if ((opts & OPT_REMOVE) &&
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!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, del, &fr) == -1) {
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fprintf(stderr, "%d:", linenum);
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perror("ioctl(delete rule)");
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}
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} else if (!(opts & OPT_DONOTHING)) {
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if (ioctl(fd, add, &fr) == -1) {
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fprintf(stderr, "%d:", linenum);
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perror("ioctl(add/insert rule)");
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}
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}
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}
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}
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if (ferror(fp) || !feof(fp)) {
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fprintf(stderr, "%s: %s: file error or line too long\n",
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name, file);
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exit(1);
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}
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(void)fclose(fp);
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}
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/*
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* Similar to fgets(3) but can handle '\\' and NL is converted to NUL.
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* Returns NULL if error occured, EOF encounterd or input line is too long.
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*/
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static char *getline(str, size, file, linenum)
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register char *str;
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size_t size;
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FILE *file;
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int *linenum;
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{
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char *p;
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int s, len;
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do {
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for (p = str, s = size;; p += (len - 1), s -= (len - 1)) {
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/*
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* if an error occured, EOF was encounterd, or there
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* was no room to put NUL, return NULL.
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*/
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if (fgets(p, s, file) == NULL)
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return (NULL);
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len = strlen(p);
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if (p[len - 1] != '\n') {
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p[len] = '\0';
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break;
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}
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(*linenum)++;
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p[len - 1] = '\0';
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if (len < 2 || p[len - 2] != '\\')
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break;
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else
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/*
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* Convert '\\' to a space so words don't
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* run together
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*/
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p[len - 2] = ' ';
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}
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} while (*str == '\0');
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return (str);
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}
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static void packetlogon(opt)
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char *opt;
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{
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int flag, err;
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flag = get_flags();
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if (flag != 0) {
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE)
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printf("log flag is currently %#x\n", flag);
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}
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flag &= ~(FF_LOGPASS|FF_LOGNOMATCH|FF_LOGBLOCK);
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if (index(opt, 'p')) {
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flag |= FF_LOGPASS;
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if (opts & OPT_VERBOSE)
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printf("set log flag: pass\n");
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}
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if (index(opt, 'm') && (*opt == 'n' || *opt == 'N')) {
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flag |= FF_LOGNOMATCH;
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if (opts & OPT_VERBOSE)
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printf("set log flag: nomatch\n");
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}
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if (index(opt, 'b') || index(opt, 'd')) {
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flag |= FF_LOGBLOCK;
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if (opts & OPT_VERBOSE)
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printf("set log flag: block\n");
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}
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if (opendevice(ipfname) != -2 && (err = ioctl(fd, SIOCSETFF, &flag)))
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perror("ioctl(SIOCSETFF)");
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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flag = get_flags();
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printf("log flag is now %#x\n", flag);
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}
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}
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static void flushfilter(arg)
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char *arg;
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{
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int fl = 0, rem;
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if (!arg || !*arg)
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return;
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if (!strcmp(arg, "s") || !strcmp(arg, "S")) {
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if (*arg == 'S')
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fl = 0;
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else
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fl = 1;
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rem = fl;
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closedevice();
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if (opendevice(IPL_STATE) != -2 &&
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ioctl(fd, SIOCIPFFL, &fl) == -1)
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perror("ioctl(SIOCIPFFL)");
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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printf("remove flags %s (%d)\n", arg, rem);
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printf("removed %d filter rules\n", fl);
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}
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closedevice();
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return;
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}
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if (strchr(arg, 'i') || strchr(arg, 'I'))
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fl = FR_INQUE;
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if (strchr(arg, 'o') || strchr(arg, 'O'))
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fl = FR_OUTQUE;
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if (strchr(arg, 'a') || strchr(arg, 'A'))
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fl = FR_OUTQUE|FR_INQUE;
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fl |= (opts & FR_INACTIVE);
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rem = fl;
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if (opendevice(ipfname) != -2 && ioctl(fd, SIOCIPFFL, &fl) == -1)
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perror("ioctl(SIOCIPFFL)");
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if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
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printf("remove flags %s%s (%d)\n", (rem & FR_INQUE) ? "I" : "",
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(rem & FR_OUTQUE) ? "O" : "", rem);
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printf("removed %d filter rules\n", fl);
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}
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return;
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}
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static void swapactive()
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{
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int in = 2;
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if (opendevice(ipfname) != -2 && ioctl(fd, SIOCSWAPA, &in) == -1)
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perror("ioctl(SIOCSWAPA)");
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else
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printf("Set %d now inactive\n", in);
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}
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void frsync()
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{
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int frsyn = 0;
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if (opendevice(ipfname) != -2 && ioctl(fd, SIOCFRSYN, &frsyn) == -1)
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perror("SIOCFRSYN");
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else
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printf("filter sync'd\n");
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}
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void zerostats()
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{
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friostat_t fio;
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friostat_t *fiop = &fio;
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if (opendevice(ipfname) != -2) {
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if (ioctl(fd, SIOCFRZST, &fiop) == -1) {
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perror("ioctl(SIOCFRZST)");
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exit(-1);
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}
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showstats(fiop);
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}
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}
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/*
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* read the kernel stats for packets blocked and passed
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*/
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static void showstats(fp)
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friostat_t *fp;
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{
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#if SOLARIS
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printf("dropped packets:\tin %lu\tout %lu\n",
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fp->f_st[0].fr_drop, fp->f_st[1].fr_drop);
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printf("non-ip packets:\t\tin %lu\tout %lu\n",
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fp->f_st[0].fr_notip, fp->f_st[1].fr_notip);
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printf(" bad packets:\t\tin %lu\tout %lu\n",
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fp->f_st[0].fr_bad, fp->f_st[1].fr_bad);
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#endif
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printf(" input packets:\t\tblocked %lu passed %lu nomatch %lu",
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fp->f_st[0].fr_block, fp->f_st[0].fr_pass,
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fp->f_st[0].fr_nom);
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printf(" counted %lu\n", fp->f_st[0].fr_acct);
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printf("output packets:\t\tblocked %lu passed %lu nomatch %lu",
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fp->f_st[1].fr_block, fp->f_st[1].fr_pass,
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fp->f_st[1].fr_nom);
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printf(" counted %lu\n", fp->f_st[0].fr_acct);
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printf(" input packets logged:\tblocked %lu passed %lu\n",
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fp->f_st[0].fr_bpkl, fp->f_st[0].fr_ppkl);
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printf("output packets logged:\tblocked %lu passed %lu\n",
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fp->f_st[1].fr_bpkl, fp->f_st[1].fr_ppkl);
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printf(" packets logged:\tinput %lu-%lu output %lu-%lu\n",
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fp->f_st[0].fr_pkl, fp->f_st[0].fr_skip,
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fp->f_st[1].fr_pkl, fp->f_st[1].fr_skip);
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}
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#if SOLARIS
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static void blockunknown()
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{
|
|
u_32_t flag;
|
|
|
|
if (opendevice(ipfname) == -1)
|
|
return;
|
|
|
|
flag = get_flags();
|
|
if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE)
|
|
printf("log flag is currently %#x\n", flag);
|
|
|
|
flag ^= FF_BLOCKNONIP;
|
|
|
|
if (opendevice(ipfname) != -2 && ioctl(fd, SIOCSETFF, &flag))
|
|
perror("ioctl(SIOCSETFF)");
|
|
|
|
if ((opts & (OPT_DONOTHING|OPT_VERBOSE)) == OPT_VERBOSE) {
|
|
if (ioctl(fd, SIOCGETFF, &flag))
|
|
perror("ioctl(SIOCGETFF)");
|
|
|
|
printf("log flag is now %#x\n", flag);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static int showversion()
|
|
{
|
|
struct friostat fio;
|
|
struct friostat *fiop=&fio;
|
|
u_32_t flags;
|
|
char *s;
|
|
int vfd;
|
|
|
|
printf("ipf: %s (%d)\n", IPL_VERSION, (int)sizeof(frentry_t));
|
|
|
|
if ((vfd = open(ipfname, O_RDONLY)) == -1) {
|
|
perror("open device");
|
|
return 1;
|
|
}
|
|
|
|
if (ioctl(vfd, SIOCGETFS, &fiop)) {
|
|
perror("ioctl(SIOCGETFS)");
|
|
close(vfd);
|
|
return 1;
|
|
}
|
|
close(vfd);
|
|
flags = get_flags();
|
|
|
|
printf("Kernel: %-*.*s\n", (int)sizeof(fio.f_version),
|
|
(int)sizeof(fio.f_version), fio.f_version);
|
|
printf("Running: %s\n", fio.f_running ? "yes" : "no");
|
|
printf("Log Flags: %#x = ", flags);
|
|
s = "";
|
|
if (flags & FF_LOGPASS) {
|
|
printf("pass");
|
|
s = ", ";
|
|
}
|
|
if (flags & FF_LOGBLOCK) {
|
|
printf("%sblock", s);
|
|
s = ", ";
|
|
}
|
|
if (flags & FF_LOGNOMATCH) {
|
|
printf("%snomatch", s);
|
|
s = ", ";
|
|
}
|
|
if (flags & FF_BLOCKNONIP) {
|
|
printf("%snonip", s);
|
|
s = ", ";
|
|
}
|
|
if (!*s)
|
|
printf("none set");
|
|
putchar('\n');
|
|
|
|
printf("Default: ");
|
|
if (fio.f_defpass & FR_PASS)
|
|
s = "pass";
|
|
else if (fio.f_defpass & FR_BLOCK)
|
|
s = "block";
|
|
else
|
|
s = "nomatch -> block";
|
|
printf("%s all, Logging: %savailable\n", s, fio.f_logging ? "" : "un");
|
|
printf("Active list: %d\n", fio.f_active);
|
|
|
|
return 0;
|
|
}
|